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drivers: timer: Add support for Apollo510 SoC system timer (STIMER)

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This commit adds support for Apollo510 SoC in ambiq stimer driver

Signed-off-by: Hao Luo <hluo@ambiq.com>
This commit is contained in:
Hao Luo 2025-02-12 11:34:39 +08:00 • committed by Benjamin Cabé
commit b9f05070be
1 changed files with 20 additions and 6 deletions
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26
drivers/timer/ambiq_stimer.c
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@ -27,13 +27,20 @@
#define CYC_PER_TICK (sys_clock_hw_cycles_per_sec() / CONFIG_SYS_CLOCK_TICKS_PER_SEC)
#define MAX_TICKS ((k_ticks_t)(COUNTER_MAX / CYC_PER_TICK) - 1)
#define MAX_CYCLES (MAX_TICKS * CYC_PER_TICK)
#if defined(CONFIG_SOC_SERIES_APOLLO3X)
#if defined(CONFIG_SOC_SERIES_APOLLO3X) || defined(CONFIG_SOC_SERIES_APOLLO5X)
#define MIN_DELAY 1
#elif defined(CONFIG_SOC_SERIES_APOLLO4X)
#else
#define MIN_DELAY 4
#endif
#if defined(CONFIG_SOC_SERIES_APOLLO5X)
#define COMPARE_INTERRUPT AM_HAL_STIMER_INT_COMPAREA
#else
/* A Possible clock glitch could rarely cause the Stimer interrupt to be lost.
* Set up a backup comparator to handle this case
*/
#define COMPARE_INTERRUPT (AM_HAL_STIMER_INT_COMPAREA | AM_HAL_STIMER_INT_COMPAREB)
#endif
#define COMPAREA_IRQ (DT_INST_IRQN(0))
#define COMPAREB_IRQ (COMPAREA_IRQ + 1)
@ -82,7 +89,9 @@ static void update_tick_counter(void)
static void ambiq_stimer_delta_set(uint32_t ui32Delta)
{
am_hal_stimer_compare_delta_set(0, ui32Delta);
#if !defined(CONFIG_SOC_SERIES_APOLLO5X)
am_hal_stimer_compare_delta_set(1, ui32Delta + 1);
#endif
}
static void stimer_isr(const void *arg)
@ -201,10 +210,14 @@ static int stimer_init(void)
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | CTIMER_STCFG_CLKSEL_Msk)) |
TIMER_CLKSRC | AM_HAL_STIMER_CFG_COMPARE_A_ENABLE |
AM_HAL_STIMER_CFG_COMPARE_B_ENABLE);
#else
#elif defined(CONFIG_SOC_SERIES_APOLLO4X)
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | STIMER_STCFG_CLKSEL_Msk)) |
TIMER_CLKSRC | AM_HAL_STIMER_CFG_COMPARE_A_ENABLE |
AM_HAL_STIMER_CFG_COMPARE_B_ENABLE);
#elif defined(CONFIG_SOC_SERIES_APOLLO5X)
/* No need for backup comparator any more */
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | STIMER_STCFG_CLKSEL_Msk)) |
TIMER_CLKSRC | AM_HAL_STIMER_CFG_COMPARE_A_ENABLE);
#endif
g_last_time_stamp = am_hal_stimer_counter_get();
@ -212,12 +225,13 @@ static int stimer_init(void)
* Set up a backup comparator to handle this case
*/
NVIC_ClearPendingIRQ(COMPAREA_IRQ);
NVIC_ClearPendingIRQ(COMPAREB_IRQ);
IRQ_CONNECT(COMPAREA_IRQ, 0, stimer_isr, 0, 0);
IRQ_CONNECT(COMPAREB_IRQ, 0, stimer_isr, 0, 0);
irq_enable(COMPAREA_IRQ);
#if !defined(CONFIG_SOC_SERIES_APOLLO5X)
NVIC_ClearPendingIRQ(COMPAREB_IRQ);
IRQ_CONNECT(COMPAREB_IRQ, 0, stimer_isr, 0, 0);
irq_enable(COMPAREB_IRQ);
#endif
am_hal_stimer_int_enable(COMPARE_INTERRUPT);
/* Start timer with period CYC_PER_TICK if tickless is not enabled */
if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) {